package com.example.demo;
import javax.servlet.*;
import java.io.IOException;
 public class MyFilter implements Filter {
 @Override
 public void doFilter(ServletRequest requ, ServletResponse resp,
 FilterChain filterChain) throws IOException, ServletException {
        System.out.println("处理请求前的处理");

         filterChain.doFilter(requ,resp);
         System.out.println("处理请求后的处理");
         }
  }